Electrically-operated hand tool



L. G. BATES I ELECTRICALLY OPERATED HAND TOOL Aug. '12, 1930.

Filed June 18, 1921 INVENTOR. Jazz/elite Q .Eafes A TTORN Y6.

Patented Aug.v 12, 1930 UNITED STATES PATENT OFFICE-'1'} LAURENCE G.BATES, O1! CLEVELAND, OHIO, ASSIGNOR TO. THE IBO'WLEB AND BUB-' DICKCOMPANY, OF CLEVELAND,

OHIO, A CORPORATION OF OHIO ELECTRICALLY-OPERATED HAND moon IApplication filed June 18,

This invention relates to. hand tools, and more particularly toolsofithe type having an electro-magnetically reciprocated mandrel; and itis among theob ectS of the invention to provide a readily controlleddevice adapted to operate with various reciprocatively driven tools orpoints as desired, such as matting tools, cutters, engraving tips,drills, pluggers, etc. Other objects and advanitages will appear as thedescription procee s;

To the accomplishment of the foregoing and related ends, the invention,then, consists of the features hereinafter fully described,

and articularly pointed out in the claims,

the ollowin drawing setting forth in detail certain con structionsembodying the invention, such being however illustrative of but a few'ofthe various ways in which the principle of the invention may beemployed.

In said annexed drawing: a 1

Fig.1 is an axial sectional view of an embodiment of the invention; Fig.2 is an ele-, vational view of the upper end of the same;

Fi s. 3 and 4 are details in plan; Fig. 5 is a detail inperspective;rFig, 6 is a section taken on the plane indicated by theline VI-VI, Fig. 1: Figs. 7, 8 and 9 are eleva- 80 tional details; Fig.10 is an elevational view of a detail modification; and Fig. 11 is asectional view of a further detail modification. Referring moreparticularly to the drawing, which illustrates the invention as appliedto a jewelers tool, the reference numerall designates a casing withinwhich is .an ele'c tro-magnet- 2. Reciprocable in the magnet.

is a mandrel 3 having an armature 4, and projecting on through thecasing to carry a tool point 5. Threaded into the uppervend of themandrel, which may be made hollow if desired, is a screw 6, the head 7of which rests on a plate-spring 8. The latter is an-..

chored at its other end by a screw 9 which is set into an insulatingheadpiece 10 fastened to the casing in any suitable manner, for instanceby screwss. This spring tends to lift the mandrel away from the magnet,and

the length of stroke isgauged by the throw 4 sired to disassemb e thetool. The plate15, escription and the annexed 1927, Serial. K0. 199,855.

allowed the armature, adjustment being had by means of the screw 6. Astirrup 11 extends from the cap 12 across in theslot 13 of the screwsuch that rotation of'the cap' correspondingly rotates the screw foradjustment. The cap may be held i'nfsuch'rot'atable posi- 5 tion in anysuitable manner, as for instance by snap-projections 14 engaging thewalls of an opening 15 in plate 15, somewhat as the parts of asnap-fastener engage. 'That is, the cap may be snapped into'place, andmay; be turned through an angle -of rotation, for adjusting the, screwand armature throw, and

yet may be readil pried off "when it is de ofdisk-like form and usuallyof insulating material is fastened to the head 10 by'suitable means,for'instance screws 16; In the head 10 there are lateral boresto receiveplug-in 7 connections from the line of operating-current supply. Acentral bore 17, preferably screw threaded, may serve to receive oneterminal plug of the lead-in wires, the one end of the magnet wire beingconnectedfto the bushing of the bore, and the other end of the magnetwinding connects to the bushingsin-i bores 18 and 19. One of theselatter. however, is a. direct connection from bushing to magnet, whilethe other goes by way of the plate-spring 8 and a. contact 20 located tocoact therewith. From this, itwill be seen that when the lead-terminalis plugged into one of the bushings, for instance 18, the cir:

cuit to the magnet goes by way of the contact? and spring, whilewhenplugged into the other bushing, thecircuit goes direct. This allows ofthe same winding to operate on either direct current or alternatingcurrent supply according as the second terminal is pluggedinto thebushing leading through. the interruptor contact or into the 'bushinleading direct. By providing one termina as a screw-threaded plug forengagement in bushing 17 and the other feed terminal as a slip plugengageable in plain bushings 18 and 19, one set of equipment mayfunction for either current. supply as available.

The design of the armature 4 is such as to particularly facilitateowerful thrust, being of a general plate or disk-like shape,

the barrel ofthe'casing."

netic leakage is minimized and the lines of force in the magnet fieldare directed to most efiectively' exerted for a strong sharp pull uponthe armature for "this usage. I

degree of flexibility or jointing such as-to allow of a certain amountof lateral play'at; the point. This may be accomplished byset ting in, alength of flexible 'shaftingor' the like 22in the centralportio'n of themandrel, or in 'the form showninfligl -,l0a-pivoti joint 23 magbefinterribsed, Iniany such was i 6 a. a smsa m her fid p d i aziprovided below. ,7 To" regulate f a c e ra e a justi g c l 24; isscrew-threadedly mounted" o'nfthe 'end of the casing, such-that themandrel andtool carried projects therethrough, being guided y e Per ng Hfm suid 25 13119 u de. is furthermore adjus'table by virtue of haw ingsplit prongs 25 whereby the oplenin" through jthei guide is exianded orretracted "seen that some" lateral] throw the clearance and adjust su asthe cap 24 is screwe moreorle'ssupon with a tool-pointrecieiving chucklA simple andpreferred form forithis comprises a ref cessecl or: tubularendfor themandrehand a point having a slightwin'g projection on" itsinner end 'this'wing projection may be pushed in past thelock'26'and'then berot'ated slightly to engage here-behind, somewhat themanner ofabayonetjoint.v

The tool points adaptable to this it levice may of course beQuite'varied'. In Fig. 1,

there is illustratedan equipment having a matting tool point 5, such aswill besuitable for fin shing mat surfaces in 'jewelers andengravers-workL In'Fig. 11, the-mandrel 3 is equipped with a tool pointfor dappin Such point may consist of an attachment 2 "to clamp on thethreaded'endof-the barrel of the casing, the mandrel bein connected 'toa pivot 28 on a lever 29. This ever mayha-ve a screw threaded socketto"receive workin points 30 of different size and contour. Suc' lever mzi'y be of first or'second class, as de' sired. he mandrel carrying sucha beaterpoint may thus be readily operated on" jewelers hollow-ware,*etc.,' particularly in difficulty-accessible"places, wherea beater'action-is wanted;

In'the use of the device, as will" be readily" understood from theforegoing,'thelead wires for the operatingcurrent 'fror'nthe'line areplugged into the Y respective socket-bores in the head ofthe-tool, onelead terminal screw be lower' end of the mandrel is equipped mounting. f

' As: already v applied maybevariedfin accordance with the theinv.ention-='may be emp ingmade as regard's'the details disclosed;

ing into the central screw socket 17, and the other lead terminal plugbeing set into the one or the other of the lateral bores 18 or 19according as direct current or alternating current is to be used, in thecase of the alternating current,'1thecircuit leading direct to the Vma'gnet,'andi the alternations of-"the; ciirrent The mandrel may be inthe form of asolid stem, forlsome uses, but in the caseof altoolparticularly adapted for jewelerls mattingand'engraving usage, I preferto introduceaserving" to intermittently} pull the armature and themandrel', whileyi'n' thecase of the.

directihurrent, I the vcir,nit= leadsthrou the interrupter contact 20whereby the'necessary throw being directed'"toflthe tool point. B

the cap in' conjunction with" a pointer 32' by Ineansof which adjustmentmay be tatedlf Where ant-era component of thrust 11 isdesired,particularly as in the case of mat i tinggthe capQ l-may'beturned-soas'to spread" Y the guidepo'rtions 25, thereby correspond ingly'allowing free orlateral lay for-"the tool p'oint5, Adjustment as to tis'niay accordspring Sin so far as its particular setting may beconcerned can be attended toin the 'origim1 assembly ofthedevice'fand'with the insulatingflsheet'33fina1ly positionedthereabove this portionlfof the' fdevice will're'quireno V flfurt-herattention: onthe part of the operator lockindent 26 thereimsuch thatwith, atool;

such adjustmentof thegthr'ow' of the mandrel seen, the particular toolpoints" particular i work,i nhand; and correspondinglyr also the sizeand weight of theassembl'y generaliywillflvary' from a; light pen-like.

device or delicate-engraving work "in the jewelry; trade on the onehand, or on the-other hand t ejcoarser typesof work in other lines willcorrespondingly: be provided for by 7 largerand heavier construction.The prin-' ciple maythus he applied to a wide rangeof inglyr be hadasrequir'edl, Adjustment ofthe'l as may berequiredjbeing had-entirelyexter- 1 'nally bythec'apin its rotatable oroscillable F metal workinfine or coarse, die work, stone Y en 'avingan cutting, etc. thermodes'of applying provided the-means stated'in any of the followingclaims or the equivalent ofsuch, be employed 'I therefore particularlypoint out and dis-l" tinctly. claim as my'inven'tion t'- '1; In a deviceof the characterdesc'ribed, the combination'of a solenoid magnet,arecipro'cable mandrel projecting through said magnet, and a disk-likearmaturese'fcured to said mandrel to reciprocate therewith and throw,said mandrel; .be1ng,adaptedto carr .3. 'II;nadevice of the characterdescribed thef combination$"of aysolenoid magnet, 'a mandrel projectingthrough said inagnet, an g armature "secured to said 1 mandrel, 1aspring "for retracting said mandrel, ahead formin having a beveled edgeadjacent the magnet, said mandrel being adapted to carry a tool.

2. In a device of the character described, the combination of a solenoidmagnet, a

mandrel projecting through said magnet, an armature secured tosaidmandrel and hav-- ing a sloping face, the face of themagnet beingcorrespondingly slopin ,a spring .for retracting; said mandrel; an anadjusting scre'w' iengaging' the s ringto control it a tool. l

part of the enclosure'ifor the armature an supporting said spring, :anladj'usting. screw" in the end of saidmandrel, and a "cap mounted onsaid headfor rotating saidscrew.

4. In a deviceofthef character described,

i the combinationof a solenoid magnet, amandrel projecting1 maturesecure to sai mandrel,a spring for retracting saidmandrel, a headforminegpart' of the enclosure for the-armature an supporting said 5ring, an adjusting screwin the end 'ofisai mandrel, and a. snap-fastening cap lmountedon said-head "for; rotating said screw. 1

5. Ina devicefofthe character described, the combination ofa solenoidmagnet, a man-' drel projecting through said magnet, an armaturesecured" to ,said mandrel,-.aaplate-" spring for returning saidzmandrel,a head forming partoftheiienclosure for the armature and to which saidspring is anchored, i and an adjusting screw bearing againstthe freeendof said spring'andthreadinginto the mandrel. V

6. In a device'of'the character. described, the combination of asolenoidmagnet, a man- I drel projecting through said magnet, an "er-'--mature secured togsaid, mandrel, a plate spring for returningsaidmandrel, a head forming part of thej enclosure. for the armature andto which oneend'of said spring is anchored,an ad'usting screw bearingagamst :the free end 0 said spring and t reading into the mandrel, astirrup engaging in the slot of said screw, and a cap mounted on saidhead for actuating said stirrup.

7. In a device of the character described,

the combination of a solenoid magnet, a mandrel projecting-through saidmagnet, an armature secured to said mandrel, a late vspring forreturning said mandrel, a ead forming part of the enclosure for thearmature and to which one end of said spring isanchored, an adjustingscrew bearin against the free end of said spring and t reading into themandrel, a stirrup engaging the slot of said screw, a cap mounted onsaid head for actuating said stirrup, and resilient throu h s'aidmagnet, an ar sition.

"8.; In a device of the Characterde'sribd,

the combination'of a solenoid magnet, a man drel projecting throughs'aidmagnet," an an mature secured to'sa-id ,inandrel and having a fslopin gface', and means iwliereby either alternatingxcurrent or dir'ec'tcurrent ;may ,energizesaidmagnet, saidiiiieans'includingv jcoizinectionsI ,direct r to V the magnet windin'g is'e aratej connection through amakea contact operated "by the mandreloe'ation. a V a In adevice of thecharacter described, the combination of a solenoid magnet, a manfdr'elprojecting through said magnet, an armature secured to said mandrel, aplate- ..spring for returning said mandrel, ahead to which one end ofsaid spring is anchored, a contact on said plate in circuit with saidmagnet, an adjusting screw in the end of I said mandrel and engagingsaid spring, and

a'cap mounted on said head for actuating said adjusting screw.

f .10. In a device of the character described,

the combination of a solenoid magnet, a mandrel projecting through saidmagnet, an armature secured to said mandrel, a plates ring engaging saidmandrel for returning t e same, a head to which one end of sai sprin isanchored, a contact on said spring,

and p ug-in connections whereby said spring- .contact' may be includedin circuit or be shunted. 1

11. In a device of the character described, the combination of asolenoid magnet, a mandrelprojectin through. said magnet, an armaturesecure to said mandrel, and means .net, a tool-carrying mandrelprojecting through said magnet, an armature secured to said mandrel, anda tapering collar threaded on the end of the casing and surrounding themandrel for varying its distance of lateral throw.

- 14. In a device of the character described, the combination of acasing, a solenoid magnet therein, a mandrel in said magnet, an armaturesecured to said mandrel, and a collar threaded on the end of the casingand having tapering split projections surrounding the mandrel forvarying its distance of lateral throw.

15. In a device of the character described, the combination of a casing,.a solenoid magi'it the'rin; a mandrel ii n Said magnet, an armature onsaid mandreLa late-s ring for returning said mandrel, a head to whichone end of said spring is anahored, an adjusting screw bearing agamstthe free 'endf pf sai' spfi'ng and-threading into the mandf'l, and acollar threaded on the (and of said casing, and havin tapering splitprojeetions surroundin t e mandrel for varying its dis; m tance oflateral throw n q Signed by me this 13th a? pf J mm, .1927.

LAURENC ,G. BATES.

